Strings in flat space and pp waves from ${\cal N}=4$ Super Yang Mills

  title={Strings in flat space and pp waves from \$\{\cal N\}=4\$ Super Yang Mills},
  author={David Berenstein and Juan Martin Maldacena and Horatiu Nastase},
  journal={arXiv: High Energy Physics - Theory},
We explain how the string spectrum in flat space and pp-waves arises from the large $N$ limit, at fixed $g^2_{YM}$, of U(N) ${\cal N} =4$ super Yang Mills. We reproduce the spectrum by summing a subset of the planar Feynman diagrams. We give a heuristic argument for why we can neglect other diagrams. We also discuss some other aspects of pp-waves and we present a matrix model associated to the DLCQ description of the maximally supersymmetric eleven dimensional pp-waves. 

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